PRV key Editing

The PRV note pane can be modified to show text instead of the keyboard. This is done by right-clicking the keyboard and selecting an option from the Note Names dialog. It is possible to create custom entries for the Note Names dialog. This is done by adding the appropriate data to the master.ins file. Here is a post discussing how http://forum.cakewalk.com/FindPost/2927516. The note pane displays a fixed number of notes though. To display a custom note binding only, consider using a Drum Map instead. It is the displayed in the Drum Pane above the Note Pane in the PRV.

I don't have issues with master.ins but it won't meet both requirements of renaming the keys AND only displaying the named keys. This why a drum map may be the better solution.

If you prefer to see note duration in the Drum Pane instead of note icons select "Show Durations in Drum Grid" from the PRV Notes menu
 
What you are asking is not possible at the moment in the note pane. The note pane will display either the full keyboard or a selection from the note names dialog with spaces where names are not provided. Additions to the note names dialog may be made to the master.ins with a text editor. The only other solution at the moment is a Drum map. It will display only the names in the map and placeholders for notes without a mapping. There may come a day when the note pane can be directly edited but I am not going to wait for it.